Symbols and Abbreviations for Structural Drawing as per IS SP:34 1987
Symbol’s relating to Cross-Sectional Shape and Size of Reinforcement:-
- φ plain round bar or diameter of the plain round bar,
- □ plain, square bar or side of the plain square bar; and
- # deformed bar (including square twisted bar) or nominal size (equivalent diameter or side) of the deformed bar
Symbols relating to the Shape of the Bar along with its Length
| Alt | Alternate bar |
| Bt | Bent bar |
| B | Bottom bar |
| min | Minimum |
| max | Maximum |
| St | Straight bar |
| stp | Stirrup |
| SP | Spiral |
| Ct | Column tie |
| T | Top bar |
Symbols Relating to Position and Direction
| EW | Each way |
| @ | Spacing centre-to-centre |
| ↔ | Limit of the area covered by bars |
| ′―‚ | The direction in which bars extend |
Symbols Relating to Various Structural
| Bm or B | Beams |
| Col | Column(s) |
| Fg | Footing(s) |
| GR | Girders |
| JT | Joints(s) |
| LL | Lintel(s) |
| LB | Lintel beam(s) |
| Sb or S | Slab(s) |
| WL | Longitudinal wall |
| Wx | Cross wall |
| CL | Centre line |
The symbols, abbreviations and notes shall be used in a manner that will not create any ambiguity. A few examples for representing diameter, spacing, number of bars, etc. illustrated below:
- # 20 @ 200 means 20 mm diameter deformed bars spaced at 200 mm centre-to-centre
- 20-#12 means 20 numbers of 12 mm diameter deformed bars
- Φ 32-St-12 EW means 12 numbers of 32 mm diameter plain round straight bars in each direction
Line and Symbol Designation in the Drawing sheet
